docs: def strip_sdist_extras(filelist):
      """Strip generated files that are only present in source distributions.
  
      We also strip files that are ignored for other reasons, like
      command line arguments, setup.cfg rules or MANIFEST.in rules.
      """
      return [name for name in filelist
              if not file_matches(name, IGNORE)
              and not file_matches_regexps(name, IGNORE_REGEXPS)]